@Sprite  
Thank’s.  
SPOILER ALERT!Twilight did indeed pee & poop herself, as did Mondancer out of sympathy & when they got back home she did Change Twilight & Herself.

@Background Pony #6308  
That is some story.

Twilight-Sparkle: You were right Moondance, these diapers are amazing, they are very warm & comfortable.  
Moondancer: I told you so, you should have listen to me all those years ago when i told you to start wearing them.  
Twilight-Sparkle: Yeah i should have listen to you back then when we were young fillies.  
Moondancer: Then why didn’t you?  
Twilight-Sparkle: Because i thought it was embarrassing back then when i was a school filly, but hey now when i am a grown Princess & i feel i can wear anything i want now without judgement.  
Moondancer: Well i’m glade that you have changed your mind now, & speaking of the word changed, these diapers sure helped you, in any normal case you usually pee at least 3 times during your library visits & pooping twice but this time you didn’t have to go this time even once.  
Twilight-Sparkle: Well i didn’t think of it &… oh no!  
Moondancer: What is it!?  
Twilight-Sparkle: I have to do pee & poop NOW! & we are WAY! too long away from home for me to be able to teleport there & get me back inside in time.  
Moondancer: Don’t worry, use your diaper & i will cange you, i prommis.